OP, please follow this forum rules.
32. Posting multiple posts in a row (excluding bumps and reserved posts by the thread starter) is not allowed.
Jokes aside, people already can "undo" or "cancel" their unconfirmed transaction thanks to existence of RBF and full-RBF. They just need to use wallet which support such feature, such as Electrum.
I guess this is only applicable when the transaction has gotten 0 confirmations.
Yes, it only applies to transaction 0 confirmation. That's why i bold text "unconfirmed".
This too should have a big risk of getting a stuck transaction usually when there is no transaction with higher fee to replace it and what if the the transaction wasn't marked as replaceable in RBF I guess Reversal will be impossible.
Even if a transaction doesn't have replaceable or RBF flag, you still can use full RBF to replace it.
for full-RBF irrespective of been marked as replaceable once there is 0 confirmation i guess it can re replaced with a transaction with higher fee. But what if there are no such transactions for a long time how long will the network congestion last?
Most node would simply drop the TX either after 2 weeks or if their mempool is full.
As usual, i see you make unique suggestion/idea on technical board. I can't wait coffee shop require 6 (5 + 1) confirmation and exchange require 11 (5 + 6) confirmation, once your idea implemented on Bitcoin network.
Jokes aside, people already can "undo" or "cancel" their unconfirmed transaction thanks to existence of RBF and full-RBF. They just need to use wallet which support such feature, such as Electrum.
Why is the exchange included in the transaction, that part of your comment/reply I do not understand ? Maybe to convert dollars into bitcoin and then pay at the coffee shop with bitcoin ?
You missed my point. My point is people who accept Bitcoin would require more confirmation in order to make sure the TX can't be reversed or undo-ed.